Psychopath’s body language is geared at concealment, so he appears to be lying all the time.
Body language environmentally determined: in prison submissive.
Invasion of personal space signals power hierarchy and ritualized pain as a form of extreme intimacy.
Narcissist’s eyes go blank when he dissociates or when his aggression (contempt, disdain) is provoked. He withdraws inwards and decompensates: both the false and true selves are deactivated.
The narcissist adopts a physical posture which implies and exudes an air of superiority, seniority, hidden powers, mysteriousness, amused indifference, etc. Though the narcissist usually maintains sustained and piercing eye contact, he often refrains from physical proximity (he is "territorial").